C++: Process terminated with status -1073741571 (0 minute(s), 3 second(s))

After build this code, I get this error: Process terminated with status -1073741571 (0 minute(s), 0 second(s)). So what should I do to solve this problem?

I'm using Code::Blocks 16.01. I tried many times but always got this error. But if this code is ran on Ideone, it is okay.

#include <bits/stdc++.h>
#define ll long long
using namespace std;
struct matrix
{
    ll val[3005][3005];
    ll row, col;
};
matrix operator * (matrix a, matrix b)
{
    matrix res;
    if(a.col != b.row)
        return res;
    for(ll i = 1; i <= a.row; i++)
        for(ll j = 1; j <= b.col; j++)
            for(ll k = 1; k <= a.col; k++)
                   res.val[i][j] = res.val[i][j] + a.val[i][k] * b.val[k] 
[j];
    res.row = a.row; res.col = b.col;
    return res;
}
matrix a,b,c;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    cin>>a.row>>a.col>>b.row>>b.col;
    for(ll i = 1; i <= a.row; i++)
        for(ll j = 1; j <= a.col; j++)
            cin>>a.val[i][j];
    for(ll i = 1; i <= b.row; i++)
        for(ll j = 1; j <= b.col; j++)
            cin>>b.val[i][j];
    c = a * b;
    for(ll i = 1; i <= c.row; i++)
    {
        for(ll j = 1; j <= c.col; j++)
            cout<<c.val[i][j]<<" ";
        cout<<endl;
    }
    return 0;
}

Thank you very much for helping!